The bristlenose's aren't strictly nocturnal, they'll be out and about eating and cleaning all day long.......as long as nobody comes near the tank!:grinyes: The minute I approach my BN tanks, everybody hides. It's perfectly normal. The young ones however could care less and are all over the tank all the time....until they are several months old. Then they also run for cover and hide when you approach the tank. I sit still like a tree in front of the tank and as long as they see no movement from me....they all come back out again. A lot of other plecos do not come out during the day at all, even when the room they are in is quiet.